Overwatch - One of my favourite multiplayer games of this gen.
Dead Cells - I've put a few hours into it and I'm having a lot of fun with it so far. The controls and combat feel great. Dying and having to start over hasn't annoyed met yet (you do get to carry some stuff over). I'd definitely recommend it to anyone who likes these sorts of games, although I've heard the Switch version has frame rate issues.
Overcooked 2 - I didn't play the first one, but I thought I'd pick this one up as it has online multiplayer now. I'm gonna see if I can get a friend or two to buy it and play it with me. It seems like it would be great fun in co-op. I played a bit of it in single player and it was fun, but I definitely know it's gonna be better with another person, rather than me controlling both chefs.
OnRush - I played the 1 hour trial a couple of weeks ago, but it's currently on sale on Xbox Live so I thought I'd pick up the deluxe edition, which was only about £1 more expensive than the regular one. I can see why some people might not like the game because it's not traditional "first past the post" racing, but I'm having a lot of fun with it. It did crash on me last night though - it just froze up mid-race, then a few seconds later the game disappeared and I was back at the Xbox home screen. I've found others with the same issue on both Xbox and PS4. There's a free play weekend for this game on Xbox Live this weekend (not sure about other platforms), so I'd recommend giving it a try.